The Laura cochlear implant programmed with the continuous interleaved and phase-locked continuous interleaved strategies.
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Algorithms↗
Biomedical subjects
L Moeneclaey
Publications and source records attributed to L Moeneclaey.
The involvement of the cochlear nerve in neurinomas of the eighth cranial nerve.
In view of recent controversies concerning the preservation of hearing in acoustic neurinoma surgery, we examined the courses of the vestibular and cochlear nerve fibers in 12 intact acoustic neurinomas studied in our department. Due to its lack of specificity, the Luxol fast blue stain was found to be inadequate for our study of the nerve fibers. In contrast, Verhoeff's stain proved to be satisfactory when combined with a highly specific immunohistochemical technique. There were macroscopically visible adherences between the tumor and the cochlear nerve in 9 out of the 12 specimens. From those specimens, histological sections were obtained in which both the cochlear nerve and tumor could be clearly identified. In these specimens the cochlear nerve was involved in the tumoral process and there was no clear cleavage plane between the nerve and the tumor. However, all these patients suffered only from minimal losses of hearing as a result of their tumors.
Cochlear Nerve↗
Normal growth pattern of the middle ear cleft in the human fetus.
The normal growth pattern of the middle ear cleft was studied on macro- and histological sections of the human fetus. When compared with adult temporal bones, the inclination of the tympanic ring remains unaltered throughout fetal development. Expansion of the middle ear cleft is caused by intrinsic growth and by lateral displacement of its constituent elements: tympanic ring, otic capsule and squamous bone. Not only are the two mutually different modes of growth movement quite dissimilar in magnitude and direction, but so is their resultant vector for each constituent; this dissimilarity in growth movement leads to a characteristic change in shape of the middle ear cleft and to curvature of the tympanic membrane. The intrinsic growth of these elements is simultaneously accompanied by remodelling of their shape; lateral displacement of the squamous bone and tympanic ring is caused by the pressure of the enlarging brain. The consequences of developmental disturbances on the normal growth pattern are discussed.
Ear, Middle↗
Differentiation of cartilage and bone in human fetal temporal bones with Luxol fast blue stain.
A modified Luxol fast blue technique was used to study the development of the temporal bone. This staining method makes it possible to make a clear distinction between the primitive cartilage present and the new forming bone. Although these tissues both contain a significant amount of collagen, their staining properties with the Luxol dyes are widely dissimilar, due to the different physicochemical properties of the collagen types involved in these tissues. The differentiation of mesenchymatous tissue into ligaments and joints can also be very clearly demonstrated with this technique. In studying the endochondral ossification process of the otic capsule and middle ear, the modified Luxol fast blue stain is a valuable technique that is complementary to more conventional staining methods.
Cartilage↗
Congenital middle ear malformations.
After a profound review of normal embryology, a systematical and topographical classification of congenital middle ear malformations in general and of meatal atresia in particular is proposed; the classification of congenital aural atresia is essentially based on the recognition of two types according to the course of the facial nerve in its third segment: in type I, a normal topography of the facial nerve is found and consequently, the middle ear anomalies are rather minimal; in type II, an antero-superior displacement of the facial nerve in its third segment is recognized and the middle ear malformations are considerable worse. In this report, also attention is paid to syndromal nosology and its genetic aspects. In view of functional surgical; reconstruction, the technique of allograft canal surgery, similar to our combined approach tympanoplasty technique, is described in detail and compared with other classical techniques. Preoperative as well as postoperative problems and complications are extensively discussed. The excellent results of our technique are proposed even after 25 years of experience. An overview of cosmetic surgery techniques is given and also alternative techniques with implantable auditory prosthetic materials are summarized.
Deafness↗
Mineral and collagen content of human ossicles.
With increased use of human otologic homograft tissue for implantation, different preservation techniques and products are used for storing and preserving the grafts before surgery. Preserved ossicles may, according to some authors, already exhibit signs of decalcification after 2 weeks. Therefore, the mineral (calcium, phosphorus) and collagen content of human ossicles (incus) and mastoid cortex and the influence of different storage techniques was biochemically investigated. No significant mineral or collagen-concentration changes were observed after a 6-week storage in pH-7 formaldehyde or in cialit, in either the ossicles or in the cortical bone. These biochemical findings are in agreement with histologic observations and with similar experiments using the photon absorptiometry technique.
Calcium↗